refactor: fix app group management and folder IDs - #1784

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Include file: "itemspage.h" not found.

Include file: "appitemmodel.h" not found.

Include file: "appgroupmanager.h" not found.

Parameter 'id' is passed by value. It could be passed as a const reference which is usually faster and recommended in C++.

There is an unknown macro here somewhere. Configuration is required. If slots is a macro then please configure it.

Include file: <algorithm> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QStandardPaths> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QSettings> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QFile> not found. Please note: Cppcheck does not need standard library headers to get proper results.

Include file: <QDir> not found. Please note: Cppcheck does not need standard library headers to get proper results.